Why are salt water batteries not used more to generate electricity on a larger scale? Putting 2 metal electrodes in salt water (like an ocean or sea?) seems so simple and inexpensive.
![Schematic illustration of the designed seawater desalination battery... | Download Scientific Diagram Schematic illustration of the designed seawater desalination battery... | Download Scientific Diagram](https://www.researchgate.net/publication/324760286/figure/fig1/AS:622644110061568@1525461332519/Schematic-illustration-of-the-designed-seawater-desalination-battery-system-and-schematic.png)
Schematic illustration of the designed seawater desalination battery... | Download Scientific Diagram
![Non-toxic salt water battery prototype can charge in seconds | Imperial News | Imperial College London Non-toxic salt water battery prototype can charge in seconds | Imperial News | Imperial College London](https://www.imperial.ac.uk/ImageCropToolT4/imageTool/uploaded-images/newseventsimage_1553096921739_mainnews2012_x1.jpg)